LiCoPO₄ - 3D carbon nanofiber composites as possible cathode materials for high voltage applications

Electrospun and carbonized 3D nanofiber mats coated with olivine structured lithium cobalt phosphate (LiCoPO₄) were formed by a Pechini-assisted sol-gel process as cathode material for lithium ion batteries. 3D nonwoven nanofibers were soaked in aqueous solution containing lithium, cobalt salts and phosphates at 80 °C for 2 h. Then, the composites were dried and annealed at 730 °C for 2 to 12 h in nitrogen atmosphere. Crystalline deposits were uniformly distributed on the carbon nanofiber surface. The "loading" of the cathode material on the 3D carbon nanofiber composites reached 300 wt%. The electrochemical measurements revealed the discharge specific capacity (measured at a discharge rate of 0.1 C and room temperature) reaching a maximum value of 46 mAh g^-1 after annealing time t = 5 h.